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e052044d6b
Refactor Checker.comparison such that its logic is easier to reason about and so that special cases can be handled more directly. Use the appropriate operand (of 1st or 2nd operand) for error reporting (position and type), rather than always using the first operand. Use an extra parameter to indicate a switch case comparison; in this case the error is always reported at the position of the first operand. (The error messages are not yet adjusted for switches; see next CL.) Introduce a new kindString function which is used to print simplified types in error messages (related to comparisons only): instead of printing the details of a struct type, we just print "struct" where the details are not relevant. This matches the 1.17 compiler behavior. Added a "reportf" parameter to the internal comparable function so we can report an error cause in addition to the boolean result. Rather than passing a *string for cause, we pass a function to record the cause so that we can use the *Checker context for printing (needed for proper type qualification). This mechanism reports the same details now as the 1.17 compiler. Adjusted various tests as needed added new test files. Fixes #50918. Change-Id: I1f0e7af22f09db4d31679c667c71a9038a8dc9d2 Reviewed-on: https://go-review.googlesource.com/c/go/+/381964 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
18 lines
437 B
Go
18 lines
437 B
Go
// errorcheck
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 11737 - invalid == not being caught until generated switch code was compiled
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package p
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func f()
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func s(x interface{}) {
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switch x {
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case f: // ERROR "invalid case f \(type func\(\)\) in switch \(incomparable type\)|can only be compared to nil"
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}
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}
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